Hi,
I often see the following 'if' construct in python code. What does
this idiom accomplish? What happens if this is not main? How did I get
here if it is not main?
Thanks,
gtb
=============== =============== =============== =
if __name__ == 'main':
myQuest('myQues t').Run() 4 3500
On 2007-03-20, gtb <go************ *@hotmail.comwr ote:
I often see the following 'if' construct in python code. What does
this idiom accomplish?
It checks to see if the file is being run as the "main"
program, and does something if that is so.
What happens if this is not main?
Nothing.
How did I get here if it is not main?
By importing the file.
if __name__ == 'main':
myQuest('myQues t').Run()
--
Grant Edwards grante Yow! Thank god!!... It's
at HENNY YOUNGMAN!!
visi.com
gtb wrote:
I often see the following 'if' construct in python code. What does
this idiom accomplish? What happens if this is not main? How did I get
here if it is not main?
...
if __name__ == 'main':
myQuest('myQues t').Run()
This idiom is for executing the code if you're running the .py directly,
or doing nothing if you're just "import"ing the module.
Take note, that when you import a module, __name__ gets the module name.
Regards,
--
.. Facundo
..
Blog: http://www.taniquetil.com.ar/plog/
PyAr: http://www.python.org/ar/
On Mar 20, 11:49 am, "gtb" <goodTweetieB.. .@hotmail.comwr ote:
Hi,
I often see the following 'if' construct in python code. What does
this idiom accomplish? What happens if this is not main? How did I get
here if it is not main?
A quick example demonstrates the usage:
C:\code>type temp.py
print "Module name is",__name__
if __name__ == "__main__":
print "I was not imported"
else:
print "I was imported"
C:\code>python temp.py
Module name is __main__
I was not imported
C:\code>python
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)]
on win32
Type "help", "copyright" , "credits" or "license" for more information.
>>import temp
Module name is temp
I was imported
On Mar 20, 12:13 pm, "Patrick Down" <patrick.d...@g mail.comwrote:
On Mar 20, 11:49 am, "gtb" <goodTweetieB.. .@hotmail.comwr ote:
Hi,
I often see the following 'if' construct in python code. What does
this idiom accomplish? What happens if this is not main? How did I get
here if it is not main?
A quick example demonstrates the usage:
C:\code>type temp.py
print "Module name is",__name__
if __name__ == "__main__":
print "I was not imported"
else:
print "I was imported"
C:\code>python temp.py
Module name is __main__
I was not imported
C:\code>python
Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)]
on win32
Type "help", "copyright" , "credits" or "license" for more information.>>i mport temp
Module name is temp
I was imported
Thanks, all! Makes great sense.
Teas all 'round the canteen now,
gtb This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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